 /*******************************************************************************
  * Copyright (c) 2000, 2005 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * Gunnar Wagenknecht - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.views.properties;

 /**
  * Extension to the standard <code>IPropertySource</code> interface.
  * <p>
  * This interface provides extended API to <code>IPropertySource</code> to
  * allow an easier indication of properties that have a default value and can be
  * resetted.
  * </p>
  *
  * @since 3.0
  * @see org.eclipse.ui.views.properties.IPropertySource
  */
 public interface IPropertySource2 extends IPropertySource {

     /**
      * Returns whether the value of the property with the specified id is
      * resettable to a default value.
      *
      * @param id
      * the id of the property
      * @return <code>true</code> if the property with the specified id has a
      * meaningful default value to which it can be resetted, and
      * <code>false</code> otherwise
      * @see IPropertySource#resetPropertyValue(Object)
      * @see IPropertySource#isPropertySet(Object)
      */
     boolean isPropertyResettable(Object id);

     /**
      * <code>IPropertySource2</code> overrides the specification of this <code>IPropertySource</code>
      * method to return <code>true</code> instead of <code>false</code> if the specified
      * property does not have a meaningful default value.
      * <code>isPropertyResettable</code> will only be called if <code>isPropertySet</code> returns
      * <code>true</code>.
      * <p>
      * Returns whether the value of the property with the given id has changed
      * from its default value. Returns <code>false</code> if this source does
      * not have the specified property.
      * </p>
      * <p>
      * If the notion of default value is not meaningful for the specified
      * property then <code>true</code> is returned.
      * </p>
      *
      * @param id
      * the id of the property
      * @return <code>true</code> if the value of the specified property has
      * changed from its original default value, <code>true</code> if
      * the specified property does not have a meaningful default value,
      * and <code>false</code> if this source does not have the
      * specified property
      * @see IPropertySource2#isPropertyResettable(Object)
      * @see #resetPropertyValue(Object)
      * @since 3.1
      */
     public boolean isPropertySet(Object id);
 }

